package com.xpalive.utils.qr;

import com.google.zxing.common.BitMatrix;
import com.xpalive.utils.qr.QRConstants.FormatName;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;

/**
 * Created by shenyuyang on 2016/11/24.
 */
public class MatrixToImageWriter {

    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    private MatrixToImageWriter() {
    }


    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }


    public static void writeToFile(BitMatrix matrix, FormatName format, File file)
        throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format.name(), file)) {
            throw new IOException("Could not write an image of format " + format + " to " + file);
        }
    }


    public static void writeToStream(BitMatrix matrix, FormatName format, OutputStream stream)
        throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format.name(), stream)) {
            throw new IOException("Could not write an image of format " + format);
        }
    }

    public static byte[] writeToByte(BitMatrix matrix, FormatName format, File logoFile)
        throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (logoFile != null) {
            image = LogoConfig.logoMatrix(image, logoFile);
        }
        try (ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1024)) {
            if (!ImageIO.write(image, format.name(), byteArrayOutputStream)) {
                throw new IOException("Could not write an image of format " + format);
            }
            return byteArrayOutputStream.toByteArray();
        }
    }
}
